Liverpool defender Virgil van Dijk blamed his side's Community Shield penalty shootout defeat to Arsenal on their profligate finishing.
The Gunners won 5-4 on spot-kicks at Wembley on Saturday after a 1-1 draw with the Premier League champions.
Pierre-Emerick Aubameyang's fine effort put Arsenal ahead but Takumi Minamino equalised in the second half with his first goal for the Reds.
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Liverpool created the better openings, with Van Dijk seeing a goal disallowed for offside and James Milner spurning a good chance, but it was Rhian Brewster's penalty miss that ultimately handed Arsenal the trophy.